Add metrics for settings conditionals

Bug: 27851236
Change-Id: I400716457d3f628419410a02c2a457d41d19a067

src/com/android/settings/dashboard/conditional/BackgroundDataCondition.java

@@ -18,6 +18,7 @@ package com.android.settings.dashboard.conditional;
 import android.content.Intent;
 import android.graphics.drawable.Icon;
 import android.net.NetworkPolicyManager;
+import com.android.internal.logging.MetricsProto.MetricsEvent;
 import com.android.settings.R;
 import com.android.settings.Settings;
 
@@ -58,6 +59,11 @@ public class BackgroundDataCondition extends Condition {
                 Settings.DataUsageSummaryActivity.class));
     }
 
+    @Override
+    public int getMetricsConstant() {
+        return MetricsEvent.SETTINGS_CONDITION_BACKGROUND_DATA;
+    }
+
     @Override
     public void onActionClick(int index) {
         if (index == 0) {